Remotely controllable portable case e.g. identifier, identifying method for e.g. permitting access to vehicle, involves controlling emission of data frame by processing unit, where frame includes alarming code for identification process

摘要

The method involves controlling periodic emission of data frame, by a central processing unit, incorporating a preamble consisting of a predefined alarming code recognizable by an identifier (B). The identifier is programmed for changing a search condition to an active condition for establishing a dialogue with the central processing unit after verifying the alarming code, where the data frame comprises another alarming code for identification process. An identification code is incorporated to a vehicle.